Diaspore deposits have now been found in a number of locations around the world, including Arizona and Pennsylvania in the USA, New Zealand, Brazil, Argentina, Russia, UK and China. But thus far the only gem-quality material has been mined in Turkey.
LuminescenceUV fluorescence: May show dull pale yellow (LW) and green (SW)
PleochroismStrong depending on body colour and source. Blue / Pale green and rose to dark red.
MagnificationDiaspore is a type II stone on the GIA clarity scale, hence small inclusions are usually found.
â€¢ Cat’s-eyes â€¢ Geological occurrence:
In metamorphosed limestones, chloritic schists and altered igneous…